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长江中游和下游夏季降水季节内振荡的差异

许乐心 张人禾 齐艳军

许乐心, 张人禾, 齐艳军. 长江中游和下游夏季降水季节内振荡的差异[J]. 大气科学, 2017, 41(6): 1125-1140. doi: 10.3878/j.issn.1006-9895.1703.17112
引用本文: 许乐心, 张人禾, 齐艳军. 长江中游和下游夏季降水季节内振荡的差异[J]. 大气科学, 2017, 41(6): 1125-1140. doi: 10.3878/j.issn.1006-9895.1703.17112
Lexin XU, Renhe ZHANG, Yanjun QI. Differences in Intraseasonal Summer Rainfall Oscillation between the Middle and Lower Reaches of the Yangtze River[J]. Chinese Journal of Atmospheric Sciences, 2017, 41(6): 1125-1140. doi: 10.3878/j.issn.1006-9895.1703.17112
Citation: Lexin XU, Renhe ZHANG, Yanjun QI. Differences in Intraseasonal Summer Rainfall Oscillation between the Middle and Lower Reaches of the Yangtze River[J]. Chinese Journal of Atmospheric Sciences, 2017, 41(6): 1125-1140. doi: 10.3878/j.issn.1006-9895.1703.17112

长江中游和下游夏季降水季节内振荡的差异

doi: 10.3878/j.issn.1006-9895.1703.17112
基金项目: 

国家重点基础研究发展计划项目(973计划) 2015CB453203

国家重点研发计划 2016YFA0600602

国家重点研发计划 2016YFA0601504

国家自然科学基金项目 41675068

中国气象科学研究院基本科研业务费 2015Z001

详细信息
    作者简介:

    许乐心, 女, 1992年出生, 硕士研究生, 主要从事夏季降水的季节内振荡研究。E-mail:xlxcams@163.com

  • 中图分类号: P466

Differences in Intraseasonal Summer Rainfall Oscillation between the Middle and Lower Reaches of the Yangtze River

Funds: 

National Basic Research Program of China (973 Program) 2015CB453203

National Key Research and Development Program Approved by Ministry of Science and Technology 2016YFA0600602

National Key Research and Development Program Approved by Ministry of Science and Technology 2016YFA0601504

National Nature Science Foundation of China 41675068

Basic Research Fund of the Chinese Academy of Meteorological Sciences 2015Z001

  • 摘要: 利用1979~2013年中国站点逐日降水资料和NCEP/NCAR再分析资料,对长江中下游夏季降水的季节内振荡最显著周期进行了分析研究。结果表明长江中游最显著周期为10~30天,长江下游最显著周期为30~60天。为了揭示这种差异产生的物理原因,进一步利用位相合成的方法对这两个区域不同周期的季节内振荡降水、高低空风场和高度场以及垂直结构和水汽等循环过程的演变特征进行分析。在200 hPa环流场上,长江中游的降水主要受到高纬度自西向东传播的波列影响,而长江下游的降水与鄂霍次克海的高度场的变化相关。在风场的垂直涡度和散度的位相结构演变过程中,10~30天的垂直涡度和散度有自北向南的移动,30~60天的垂直涡度和散度在长江以南地区有自南向北的传播。水汽输送的位相发展过程表明,长江中游的水汽分别来自于南海的向北输送和长江以北地区向南的水汽输送;长江下游地区的水汽则主要来自于热带东印度洋经孟加拉湾的向东输送并在南海的北向输送,以及西太平洋水汽向西输送到南海再向长江下游的输送。从高层大尺度环流场和整层积分的水汽通量输送上解释了长江中游10~30天降水的自北向南移动,和长江下游30~60天降水自南向北传播的原因。
  • 图  1  1979~2013年长江中下游区域夏季降水季节内振荡最显著周期分布,其中红色方框区域为本文选取的长江中游(27°~32°N,106°~115°E)和长江下游地区(27°~32°N,115°~123°E)

    Figure  1.  Distribution of the most significant intraseasonal oscillation periods of summer rainfall over the middle reaches of the Yangtze River (MYR) (the left red box; 27°–32°N, 106°–115°E) and the lower reaches of the Yangtze River (LYR) (the right red box; 27°–32°N, 115°–123°E)

    图  2  长江中游季节内尺度降水序列的小波图:(a)逐日季节内尺度降水序列;(b)季节内尺度降水序列的小波分析频谱;(c)小波全谱

    Figure  2.  Wavelet spectra of the time series of intraseasonal rainfall over the MYR: (a) Time series of the ISO (Intraseasonal Oscillation) rainfall; (b) wavelet power spectrum of intraseasonal rainfall; (c) full wavelet spectrum

    图  3  长江下游季节内尺度降水序列的小波图:(a)逐日季节内尺度降水序列;(b)季节内尺度降水序列的小波分析频谱;(c)小波全谱

    Figure  3.  Wavelet spectra of the time series of intraseasonal rainfall over the LYR: (a) Time series of the ISO rainfall; (b) wavelet power spectrum of intraseasonal precipitation; (c) full wavelet spectrum

    图  4  1979~2013年5~10月降水原始序列(直方图,单位:mm)和标准化的滤波序列(红色曲线,单位:mm):(a)长江中游地区(10~30天滤波);(b)长江下游地区(30~60天滤波)。黑线为正/负1倍标准差,数值表示准双周振荡位相

    Figure  4.  Time series of daily rainfall in summer (gray bars; units: mm) and standardized series of the filtered rainfall anomaly (red solid line; units: mm): (a) Over the MYR (10–30-day filtered); (b) over the LYR from 1979 to 2013 (30–60-day filtered). Black lines represent±1.0 times of standard deviation of the ISO rainfall, numbers represent the phase of the biweekly oscillation

    图  5  10~30天夏季降水的各位相合成(单位:mm d-1),黑色方框代表长江中游地区

    Figure  5.  Composite 10–30-day filtered summer precipitation (units: mm d-1). The black box represents the MYR region

    图  6  30~60天夏季降水的各位相合成(单位:mm d-1),黑色方框代表长江下游地区

    Figure  6.  Composite 30–60-day filtered summer precipitation (units: mm d-1). The black box represents the LYR region

    图  7  长江中游(红色方框)降水10~30天振荡各位相合成的850 hPa低频位势高度场(阴影,单位:gpm)与850 hPa低频风场(矢量,单位:m s-1),只画出大于0.1 m s-1的风矢量,黑线代表青藏高原高度大于3000 m的部分

    Figure  7.  Composite 10–30-day filtered 850 hPa geopotential height (shading; units: gpm) and wind (vectors; units: m s-1) over the MYR (the red box). Only wind speeds larger than 0.1 m s-1 are shown. The black contour indicates the Tibet Plateau region with elevations exceeding 3000 m

    图  8  长江中游(红色方框)降水10~30天振荡各位相合成的200 hPa的低频位势高度场(阴影,单位:gpm)与低频风场(矢量,单位:m s-1),只画出大于0.2 m s-1的风矢量

    Figure  8.  Composite 10–30-day filtered 200 hPa geopotential height (shading; units: gpm) and wins (vectors; units: m s-1) over the MYR (the red box). Only wind speeds larger than 0.2 m s-1 are shown

    图  9  长江下游(红色方框)降水30~60天振荡各位相合成的850 hPa的低频位势高度场(阴影,单位:gpm)与低频风场(矢量,单位:m s-1),只画出大于0.15 m s-1的风矢量,黑线代表青藏高原高度大于3000 m的部分

    Figure  9.  Composite 30–60-day filtered 850 hPa geopotential height (shading; units: gpm) and wind (vectors; units: m s-1) over the LYR (the red box). Only wind speeds larger than 0.15 m s-1 are shown. The black contour indicates the Tibet Plateau region with elevations exceeding 3000 m

    图  10  长江下游(红色方框)降水30~60天振荡各位相合成的200 hPa的低频位势高度场(阴影,单位:gpm)与低频风场(矢量,单位:m s-1),只画出大于0.2 m s-1的风矢量

    Figure  10.  Composite 30–60-day filtered 200 hPa geopotential height (shading; units: gpm) and wind (vectors; unit: m s-1) over the LYR (the red box). Wind speeds larger than 0.2 m s-1 are shown

    图  11  经过(106°~115°E平均)剖面的10~30天滤波的涡度场(阴影,单位:10-6 s-1)和散度场(等值线,实线为正值,虚线为负值,单位:10-6 s-1,等值线间隔为10-7 s-1)的各位相合成

    Figure  11.  Composite vertical cross sections of 10–30-day filtered vorticity (shading; units: 10-6 s-1) and divergence (contours; solid lines represent divergence and dotted lines represent convergence; units: 10-6 s-1.The contour interval is 10-7 s-1.) averaged over the region of 106°–115°E

    图  12  经过(115°~123°E平均)剖面的30~60天滤波的涡度场(阴影,单位:10-6 s-1)和散度场(等值线,实线为正值,虚线为负值,单位:10-6 s-1,等值线间隔为10-7 s-1)的各位相合成

    Figure  12.  Composite vertical cross sections of 30–60-day filtered vorticity (shading; units: 10-6 s-1) and divergence (contours; solid lines represent divergence and dotted lines represent convergence; units: 10-6 s-1.The contour interval is 10-7 s-1.) averaged over the region of 115°–123°E

    图  13  位相合成的整层积分的低频水汽通量输送(矢量,单位:kg s-1 cm-1)及其散度(阴影,单位:10-5 kg s-1 cm-2):(a、b)长江中游地区;(c、d)长江下游地区。红色方框表示所讨论区域;只画出大于图右上角标值10%的水汽通量输送矢量

    Figure  13.  Composite vertically integrated moisture fluxes (vectors; units: kg s-1 cm-1) and their divergence (shading; units: kg s-1 cm-1): (a, b) Over the MYR region (the red box); (c, d) over the LYR region (the red box). Integrated moisture fluxes larger than 10% of the vector scale are shown

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出版历程
  • 收稿日期:  2017-01-18
  • 网络出版日期:  2017-03-16
  • 刊出日期:  2017-11-15

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